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In a similar way starting with CTC12 chassis, RCA tied the CRT cathode bias to the shunt regulator grid.
This allowed shunt regulator to be cut-off during extremely bright scenes, regulate only during darker material to maintain load on HV supply.
It seemed to reduce a "blooming" issue with a CTC11, was tough to mitigate with just HV, brightness/contrast controls.
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"When resistors increase in value, they're worthless"
-Dave G
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